江西德兴斑岩铜矿成矿物质来源的实验研究  

THE EXPERIMENTAL STUDY ON THE SOURCE OF THE ORE-FORMING MATERIALS FOR THE DEXING PORPHYRY COPPER DEPOSIT, JIANGXI PROVINCE

作　　者：梁祥济[1] 

机构地区：[1]中国地质科学院地质研究所

出　　处：《地质论评》1995年第5期463-472,共10页Geological Review

摘　　要：在江西德兴斑岩铜矿的野外地质、地球化学研究工作的基础上，采用该矿床围岩－前震旦系九岭群九都组的变质岩作为实验试料，在２５０－４００℃和２００×１０＾５－５００×１０＾５Ｐａ的压力下，与不同酸度（ＰＨ＝１．５－４．５）、不同浓度（０．１２５５Ｍ－１．００Ｍ）的钠、钾、氯和氟化物等水溶液持续１２０－４８０ｈ的相互作用，其结果从变质岩中活化出铜２９．０１－１６５４．２４ｍｇ／ｍＬ，最高达２２６８５．Field geological evidence indicates that there is genetic relation between the ore bodies of the Dexing porphyry copper deposit and their wall rocks-metamorphic rocks of the Jiudu Formation of the pre-Sinian Jiuling Group in southern China. On that basis the author used the metamor-phic rocks as experimental starting materials. Reactive solutions of NaCl+KF with various concentrations (0. 125 5 M-l. 00 M) and various acidities (pH=1. 5 - 4. 5) were prepared according to the chemical compositions of mineral inclusions and rocks in the ore deposit.All experiments were performed in the pure-titanium acid-resisting and alkali-resisting high-pressure vessels. The temperatures were controlled by the automatic precise controls (JWK -703) and were measured with standard Le Chatelier thermocouples (LB-3). The pressures were calculated by the stuff degree according to the P-V-T Table made by G. C Kennedy.Results of the experiments show that at 250 - 400℃ and 200× 105 Pa- 500× 105 Pa, the ore-forming metal elements were activated and removed from the rocks during the interaction of the Na and K halogenide solutions of various concentrations and various acidities with the starting materials of metamorphic rocks for 120 - 480 hours. The contents of the activated elements are: Cu, 29. 01 - 1 654. 24 ng/mL, with a maximum of 22 685. 00 ng/mL; Mo, 200. 00 - 2 720. 00 ng/mL, with a maximum of 9 990. 00 ng/mL; Pb, 34. 90 - 106. 00 ng/mL, with a maximum of 270. 90 ng/mL; Zn, 20. 00 - 800. 00 ng/mL, with a maximum of 3 200. 00 ng/mL. They constitute ore-forming substances of hydrothermal solutions.The experiments have verified that the Jiudu Formation of the pre-Sinian Jiuling Group is the source bed of ore-forming metal elements of Dexing porphyry copper deposit.

关 键 词：成矿物质来源 铜 钼 斑岩铜 矿 铜矿床 

分 类 号：P618.410.4[天文地球—矿床学]